Apple's online store has gone down. When the store goes down in the middle of the week it's often an indication that new stuff is in the wings, but that's not always the case. The recent MacBook Pro refresh snuck in completely under the radar, after all, and sometimes Apple takes the store offline for maintenance or minor tweaks.
Oddly enough, as of this writing it seems only the US Apple Store is down. All the international stores we've checked so far still seem to be up. One possible addition to